In awarding compensation the commission may not indulge in the assumption of a mere possibility in the nature of a guess as to whether plaintiff is entitled to compensation, see Ginsberg v. Burroughs Adding Machine Co., 204 Mich. 130, but the commission may draw reasonable inferences from established facts; see Standard Drug Store v. A.E. Wood Co., 227 Mich. 333. In Featherly v. Central Paper Co., 281 Mich. 562, plaintiff fell and injured himself in September, 1933. He continued to work until August, 1935, when it was found that he had osteo sarcoma, which caused total disability. We approved the following taken from an opinion of the department: